Marine reversing gearing

Abstract

A marine reversing gearing having a forward clutch which is coaxially arranged with respect to a drive shaft. A pinion of a first gearing stage or train can be coupled with the drive shaft by means of the forward clutch. Two mutually parallel gears of the first stage continuously mesh with the pinion of the first stage. A power take-off shaft can be driven by means of both gears of a second gearing stage or train. There is also provided a set of reversing gears composed of a number of reversing gears and at least one reverse clutch which is likewise coaxially arranged with regard to the drive shaft. The set of reversing gears can be coupled with the pinion of the first gearing stage by said at least one reverse clutch. For engaging and disengaging the forward and reverse clutches a slowly rotating auxiliary drive having reversible direction of rotation is connected by means of a reverse movement blocking device with the drive shaft.

What I claim is: 
     
       1. A marine reversing gearing comprising: a drive shaft;   a forward clutch essentially coaxially arranged with respect to said drive shaft;   a first gearing stage comprising a pinion which can be operatively coupled by said forward clutch with said drive shaft;   the first gearing stage further comprising two essentially mutually parallel arranged gears continuously meshing with said pinion of said first gearing stage;   a second gearing stage including two gears;   a power take-off shaft drivable by means of said two gears of said second gearing stage;   a reversing gear set composed of a number of reversing gears;   at least one reverse clutch essentially coaxially arranged with respect to said drive shaft;   said reversing gear set being engageable and disengageable with the pinion of the first gearing stage by means of said at least one reverse clutch;   a slow rotating auxiliary drive having reversible direction of rotation;   a reverse movement blocking device; and   said slow rotating auxiliary drive being connected by means of said reverse movement blocking device with said drive shaft for engaging and disengaging the forward and reverse clutches.   
     
     
       2. The marine reversing gearing as defined in claim 1, wherein: said reversing gear set comprises a first central reversing gear by means of which said at least one reverse clutch can be coupled with the pinion of the first gearing stage;   a second central reversing gear;   a number of peripheral reversing gears; and   said first central reversing gear being connected by said number of peripheral reversing gears with said second central reversing gear.   
     
     
       3. A marine reversing gearing comprising: a drive shaft;   a forward clutch essentially coaxially arranged with respect to said drive shaft;   a first gearing stage comprising a pinion which can be operatively coupled by said forward clutch with said drive shaft;   the first gearing stage further comprising two essentially mutually parallel arranged gears continuously meshing with said pinion of said first gearing stage;   a second gearing stage including two gears;   a power take-off shaft drivable by means of said two gears of said second gearing stage;   a reversing gear set composed of a number of reversing gears;   at least one reverse clutch essentially coaxially arranged with respect to said drive shaft;   said reversing gear set being engageable with the pinion of the first gearing stage by means of said at least one reverse clutch;   a slow rotating auxiliary drive having reversible direction of rotation;   a reverse movement blocking device;   said slow rotating auxiliary drive being connected by means of said reverse movement blocking drive with said drive shaft for engaging and disengaging the forward and reverse clutches;   said reversing gear set comprises a first central reversing gear by means of which said at least one reverse clutch can be coupled with the pinion of the first gearing stage;   a second central reversing gear;   a number of peripheral reversing gears;   said first central reversing gear being connected by said number of peripheral reversing gears with said second central reversing gear;   a second reverse clutch for coupling the second central reversing gear with the drive shaft;   one of both central reversing gears meshing with two mutually parallel stationarily mounted intermediate gears;   said number of peripheral reversing gears including respective peripheral reversing pinions;   each of said two mutually parallel stationary intermediate gears meshing with a respective one of the peripheral reversing pinions; and   each of said peripheral reversing pinions being rigidly connected with a respective coaxially arranged one of said peripheral reversing gears which meshes with the second central reversing gear.   
     
     
       4. A marine reversing gearing comprising: a drive shaft;   a forward clutch essentially coaxially arranged with respect to said drive shaft;   a first gearing stage comprising a pinion which can be operatively coupled by said forward clutch with said drive shaft;   the first gearing stage further comprising two essentially mutually parallel arranged gears continuously meshing with said pinion of said first gearing stage;   a second gearing stage including two gears;   a power take-off shaft drivable by means of said two gears of said second gearing stage;   a reversing gear set composed of a number of reversing gears;   at least one reverse clutch essentially coaxially arranged with respect to said drive shaft;   said reversing gear set being engageable with the pinion of the first gearing stage by means of said at least one reverse clutch;   a slow rotating auxiliary drive having reversible direction of rotation;   a reverse movement blocking device;   said slow rotating auxiliary drive being connected by means of said reverse movement blocking device with said drive shaft for engaging and disengaging the forward and reverse clutches;   said reversing gear set comprises a first central reversing gear by means of which said at least one reverse clutch can be coupled with the pinion of the first gearing stage;   a second central reversing gear;   a number of peripheral reversing gears;   said first central reversing gear being connected by said number of peripheral reversing gears with said second central reversing gear;   planetary gear support means;   said peripheral reversing gears comprise planetary gears mounted in said planetary gear support means; and   each of said planetary gears meshing with both central reversing gears.   
     
     
       5. A marine reversing gearing comprising: a drive shaft;   a forward clutch essentially coaxially arranged with respect to said drive shaft;   a first gearing stage comprising a pinion which can be operatively coupled by said forward clutch with said drive shaft;   a first gearing stage further comprising two essentially mutually parallel arranged gears continuously meshing with said pinion of said first gearing stage;   a second gearing stage including two gears;   a power take-off shaft drivable by means of said two gears of said second gearing stage;   a reversing gear set composed of a number of reversing gears;   at least one reverse clutch essentially coaxially arranged with respect to said drive shaft;   said reversing gear set being engageable with the pinion of the first gearing stage by means of said at least one reverse clutch;   a slow rotating auxiliary drive having reversible direction of rotation;   a reverse movement blocking device;   said slow rotating auxiliary drive being connected by means of said reverse movement blocking device with said drive shaft for engaging and disengaging the forward and reverse clutches; and   said forward and reverse clutches each comprise self-synchronizing and engageable synchronous clutches.   
     
     
       6. A marine reversing gearing comprising: a drive shaft;   a forward clutch essentially coaxially arranged with respect to said drive shaft;   a first gearing stage comprising a pinion which can be operatively coupled by said forward clutch with said drive shaft;   the first gearing stage further comprising two essentially mutually parallel arranged gears continuously meshing with said pinion of said first gearing stage;   a second gearing stage including two gears;   a power take-off shaft drivable by means of said two gears of said second gearing stage;   a reversing gear set composed of a number of reversing gears;   at least one reverse clutch essentially coaxially arranged with respect to said drive shaft;   said reversing gear set being engageable with the pinion of the first gearing stage by means of said at least one reverse clutch;   a slow rotating auxiliary drive having reversible direction of rotation;   a reverse movement blocking device;   said slow rotating auxiliary drive being connected by means of said reverse movement blocking device with said drive shaft for engaging and disengaging the forward and reverse clutches; and   self-locking gearing means for connecting the auxiliary drive with the reverse movement blocking device.   
     
     
       7. The marine reversing gearing as defined in claim 6, wherein: said reverse movement blocking device is self-synchronizing and comprises control means bringing about an automatic clutching action.